Adjustable scaffolding.



F. C.- McCLANAHAN. ADJUSTABLE SCAFFOLDING. Arrucmou msn rsa. 29'. ms.

Patented Dec. 25.1917.;

aman,

F. C. MCCLANAHAN.

lAIIUUSTAELE SCAFFOLDI-NG.

Arrucmon min 3.29. me.

Patented Deo.- 25, 1917 5 SHEETS-SHEET 2.

F. c. yMCGLMIAHAIsl. ADIUSTABLE SCAFFOLDING.

APPLICAIO'N FILEDV FEB. 29. IMG.

man@ Dee. 25.1917.

.Gwummw y y AM `F. C. MCCLANAHAN. ADJUSTABLE SCAFF'GLDING. APPucATloN FILED FEB. 29. 191s.

Patented Dec. 25, 1917.y

5 SHEETS-SHEET 5.-

5l I 5 Y UNITED STATES PATENT OFFICE.

FREDERICK C. `MGC'LANARAN, OF LITTLE ROCK, ARKANSAS.

ADJpsTABLE scarronnnve.

v Specication'of Iietters'letent. Pdtentd Dec. 25,191.7.

Appncatinnlearebxary 29,1916. serilainaslaso. f

To all whom it may concern.- t

' Be it known that I, Finannlnon C. Mc-

, CILANAHAN, a citizen of 'the United States,

I bodiesalplurality of scaii'ovldsand nieans for raislhg" andl lowering them at will.

Another objectk of the invention is to pro vide ahois'ting apparatus, which is`combined ivi'th one of the scatfolds yandl israised or lowered therewith.

y LAnother object is to effect mea-ns in `the construction of the scaft'olds. Another object of the'invention is to efect improvements' in thepconstruction of the means for raising and lowering the scaffolds and hoisting themechanism.

Another object is to effect improvements in the construction of the moldy forms.

The invention consists in the construction, combination, and arrangement of devices, hereinafter described and claimed.

In the accompanying drawings Figure 1 is an elevation of a concrete con struction system embodying my invention and yshowing in cross section, the Wall of a silo in course of construction.

Fig. 2 is a horizontal sectional view of the same on the plane indicated by the line a-c of Fig. 1. y

Fig. `3 is a detail horizontal sectional view of the lower scaffold and through the mast.

Fig. 4 is a detail vertical sectional view of the upper portion of the mast, the upper scafold, the hoisting boom and its connections and the hoisting mechanism.

Fig. 5 is a detail vertical transverse sectional view through one of the arms of the upper scaffold.

i Figs. 6 and 7 are detail sectional views respectively on the planes. indicated on the lines Zi-b and c`c of Figl.

Fig; 8 its a detail elevation' of some of the inold'sections.'

Fig. 9 is partly an elevation and partly a Sectional. view of the core mold for use in Vthe chute of a silo.

Figs. 10, 11, and 12 are detail vietv's.

In the embodiment of the invention", Ip'ro.- 'n

vide a` mast l andaplurality vofsca olds are slidablymountedfon tlieinast and arrangedto be raisel vo'rlo'iverec'l as required). Tivo of such scaffblds are here "shoivn, the lower scaffold being-increment 2 sa ai@ upper scaifld 'atqfflh'elmast is ll'rell'erably steell or iron `(pipe: siiitable`v 'intreiniris andis provide its upperen'dA Y'Vith "a cio'llarv 4 having radial arns 54 to which able'guys 6 are attached.

'The'lonierfscaoll has ,a czentrally arl ranged .tubular sleeve 7 throu li' the HiStPiS'Se iandyyhel iS a erl) fo' b raisedand lowered on; the mast."i Radially arranged bracket a'rit'nsil `are securedtosaid sleeve near its upper end and 4the inner ends of thenarms 9 ofthe lovvei* scaffold arey se cured to said bracket arms; 'eachlbwervscaffold' comprising al pair of'lL-bars 10 y,

which are bolted `together in spaced 4relai- ""5 tion as at 11, and the inner ends of which are bolted on opposite sides of the braeket arms as at ll. Triangular attaching irons l2 are riveted betiveen the membersl oft'hje arms 9 at points near their outer ends and ythe upper ends ofbraces v13 are riveted to said irons l2, saidbraces each comprising a pair' of L-bars and their lower ends being bolted or riveted to radially arrange bracket arms 14 at the lower end of the tubii- 'i lar sleeve `7. Hence the loi'ver scaffoldis entirely carried by the sleeve 7 and may .be raised and lowered therewith on the mast. Suitable flooring boards 15 are laid on and secured to the scaffold arms 9.

The upper scaffold has a tubular sleeve 1G which is longer than the sleeve 'T and is also arranged for vertical movement on the mast. The arms 17 of the upper scaffold each comprise a pair of spaced inverted yL- bars 18, the inner ends of which are bolted to opposite sides of the bracket arms 19 which are secured to the lower portion of the sleeve 1G. Each ann of the upper scaffold A also comprises a radially adjustable inverted T-inember 20, the vertical web of which is arranged between the L-bars 18 and the horizontal web or tread of which is arranged to bear on rollers 21 whichrollers are mounted for rotation on U-bolts 22 which are secured to the horizontal outstanding webs` of the L- irons 18 as shown in detail at Fig. 5. Hence,YA

. plates 29 on the arms 17 ofthe upper scaffold, said plates being arranged inpairs and the lower; endspi' the braces being-arranged between the'4 saidV plates. Neary the Tupper end of the sleeve lfare collars'O, 31. Said collars are respectivel ,providediwith radial arms 32,33. A trac ringlll is attached tothe lower ends of the arn1`s 3 2'and al somewhat smaller track ring ay Vached to the upper ends ,of thel arms 33. 5 ,A boomj'ti which comprises a pair of spaced L-bars 37 has upper and lowerI bearing plates 38, 39, secured to its inner end by rivetsgorrbolts 10.. Peripherally gr'ooved rollers 41' are mounted between said plates, on bolts and engage the outer side of the trac1rring"25.y AI plate 42 is provided with an axle/ 13 on 'which peripherally ygooved rollers .44,f,4,5, are. mounted, said rollers respectively engaging' thetrack rings 31, 35,

,. and saidfplateb'eing arranged between said ,track'ringsg A'v brace 46 is providedfor the boom and comprises a pair of L-bal's 47. -A hook 48 is bolted between said L-bars at their upper ends as at 49 and engages the plate 42 as at` 5O. A similar hook 51 is bolted between'the lower ends of said L-bars and engage the boom Vand is connected thereto as at 52.- A brace 53has its upper end attached to the brace `16 and its lower endl attached to the boom as shown. The boom may be turned inrit-her direction as desired, and may be swung around the mast. At the outer end of the boom is a pulley 5-1. A similar pulley 55 is mounted near the inner end of the boom. A pulley 56 is connected as at 57 to the lower end of the mast. A suitable hoisting cable 58 engages the pulleys 56, 55, 54, andasuitable bucket 58" is suspended from the outer end of the cable by a bail 59 and may be used for hoisting concrete or other material as required in the building of the wall or other parts of the structure. A suitable lever 60 is provided for tilting the bucket to dum out its contents and is detachably fitted 111 socket pieces 61 with which the bucket is'provided.

A safety grip to prevent the accidental dropping of the tubular sleeve 16 and its connections is indicated at 113 in Fig. 1.

A pulley 63 is mounted at the upper end of the mast. Frames 64, 65, are bolted together and are also bolted tothe lower portion of the sleeve 16 as at 66, said frames extendin'gin' opposite directions from the sleeve. A drum 67 is mounted in the frame- 64 anditsfshaft is provided at one end with a spurgear .GS which is engaged by a pinion 69 on ashaft 70, said shaft being mounted in the sides of said f ranie `and being y pro` vided with a crank 7,1.V A drum 72y is mountedfiirthemframe 65 and has its shaft provided with a spur gear 73. Said gear is engaged by a pinion'74L-on a shaft 75 which scribed, the'upper scaffold, tgethenwith/the i boomI may 4be raised onlowered as be desireci\ A cable 79 is provided for raising or lowering the lower, scaffold. The, .lfowe'r end of this cable is connected as at SQhto the lower sleeve 7 and its;up'pe r. vend is attached to the drum 67. .Said Idruni may lbehopferated by the crank71`asiwillbeunderstood, to raise or lower the loilver scaffold.

:The forms 8.1-for moldiiigtthellconcrete wall 82 'of the structureare'hoist'edl from time to time as the constructionl proceeds with` theupper scaffold a'ndhy vmeans of chains 82 ,attached togthecxtensible Vmembers 18 otsaid scaffold; arms 17, and hooks 82, at the lower ends of-said chains. Said hooks may be connected tov eyesor clips 84 which are attached to reinforcing L-bars 85 of the mold sections 86, saidmold sections being here shown as of oblong rectangular form and being metal plates of suitable dimensions and thickness,y the said L-bars of the mold sections connected together by dowels 85, each dowcl being headed in one L-bar'and adapted to enter an opening in another. The L-bars ofthe mold 'sections are also connected together at the sides and ends of the mold sections by clamps 86, each of which comprises arms 87 88, respectively, riveted to the L-bars, links 89 pivotally connected as at 90 to the plate 87 and a lever 91 pivotally connected asat 92 to the links and having an eccentric cam 93 for engagement with the arm 88 lThese clamps coact with the dowels in closely connecting the mold sections together.

Reinforcing elements 94 which are here shown as consisting of detachable links are held imposition between the 'meer and Outer #oplei cffthll gulvtveutmej` be obtained lfor forma byibracketsy 95 and adjustable hooks,

" 96.y Each bracket/has ebook vshaped horiak n zontal arme` 97 ftol ,bearv on' the upper edge of` fthe uppermost `outside lfoim and engage unj derv theLfbar thereof and is proyidedfwithj y ,v anhopenin through which one of thedowels.

j v.extend 1 e. arm `98iwlhichoverhangs the inner vside of "theouterform and extendsv upwardly*there ufrqi yandra-is provided `with a ysieriesf'ol adif e ting openings 99, any one yoffwh'ich may` be., engaged by the substantially* Sfshaped ach bracket also" had la' vertical upper arm lOOof'the :hook 96:.`

','To `mold "they inner side of thechuteyl yof the silo I provide a core/,mold 102Whi comprises 'overlapping' rnold plates or rsec- `tions 1103 which haveV vertically' varranged- 'eL-bx'irsflfllon'v their inner` sides lnear' their overlapping edges. `The outer ends olinksy "105 are arrangedjbet'ween said Lfbare and' *y a.: pivotallyconnected theretobyjbolts106,jthe

f l vinnerfende of said links being pivotally con-I nect'edas at-107to radial' armsflOS'on a vcr-V ticallyarrangedcentral rod 109,'which;` has j fa'ring 110 at its upper end. By drawing y"'Sitilre'd upwardly, the links serve te drawl f f the'mold sections 103 inwardly and thus permit theadjustment'ofthe core'ni'old inthe chute andthe progressive lift'ng of the core y niold inv the"` chute from time to timegas they onstruction` progresses. To yprevent the -`j1inks 105 from moving downwardly past a horizontal position,Vy the rod-109fis provided I i with circular heads 111 to bear on s aid links" i La srahown,` A pipe v112is arran edon the "rod 109 andante as" afseparator,l ho ding the link or spreader arm 'units 105 in' the required relativegposltlon.' This core mold or vchute formmay be raisedby the boom and cable `58 aswill beunderstgxni;"`

' In'` the'operation of myvapparatus, whenvv v constructing a concrete vWall or'thelike, lafter allof: the'sections'of [the forms have been lled `with `concrete Aand ythf'i concrete y'is' sufficient1yfset,` the lower seetionsgof--outsidey forms are `firstsec'ured yby chains and hooks 82, 83, the clamps 86am loosened, and the.;y lower Section thus permitted to expand and to be suspended from the arms of the up er `scall'oldbythe chalns 82 'as' will be `un er- I stood. All the members ofr thelower section y L 'areraiejed in onel operatlonandsimultane n '.rnastf,` a 'flower scaffoldy slidablefyertieall live `cents each, hy addr 'vwnhlngte'm 121.03

Q'siyl; salu hens 112 ag empleada. yporarily, loosel ForA removing-- the inside forrns,v the lower' "1 lsection is 'released vby "first -f loosening v the clamps on the'vertical sides thereof.

permitsv one vertical l p ated, befrejthe meer y connectingv thejnrenibes `of inside sectiousfoftheiforms are raised.` f n When concrete or ,other material f has lbeen by engagingits bail 59-with ahook 114 'at p ythe table y 5 8" and the fboom, the` i bucket p 58*v maybe suspended from `the "boom the -lower`end offafchan 11.5r` which hangar v `the mast, vrasleeve abofvethev lower scaffold' Q and slidable vverti'callytm the jmast, lanlupper and IrillljleV therewithya pairl 0f at the other end v to one of thev drums;- :fior

raisingivand lowering' the" upper scaffold tofygether with said drums;.andafsecondcable y attached? 'to the` y,other drum and also to the lower, scaold te raiseforvlowerf the lower.

seafioldv either siniultaneolfislyfwth,or\inde-` pendently of the upper scalfold.'v

@2.7.2111, apparatus! of theclass describedpe.

scaffold `luiving 'arms'each .comprising a pai 4'olaIIglebal-s arranged in spaced relatie radially adjustable cross sectionally 'F1-Shape `memberhaving its `vertical Webar'ranged between said bars `and its yhoriaontal'webj ar ranged'junder4 said bars, and .rollers edfto said bars.'

FREDERICK VVit'nessess v v e CLYDE PAGE`,' 1. ,e l

KIRBY "Bonnema,

mounted 'in said frames a pulley on the upper end` of the mast, alcabl'e `'passing :oversaid' pulley, attachedat one rendl to the frame and `w "whieh said ymember bears,y.said`rollersl`hav "ing Un-shagedbearing and "supportingmeml f bers attac j vIii-testimony whereof `Ialli`x, `1r1y :signature .in presencefof two witnesses.

slug th'ektlonnuiuloner 

